Inconel 718 Round Bar Supplier in India — UNS N07718 / Werkstoff 2.4668
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Aashish Metals is a trusted supplier and stockist of Inconel 718 round bars in India, maintaining ready stock of this premium precipitation-hardenable nickel-chromium superalloy from our Mumbai facility. Our Inconel 718 bars conform to ASTM B637 / ASME SB637 and key aerospace material standards including AMS 5662, AMS 5663, and AMS 5664, and are available in diameters from 2 mm to 800 mm with lengths from 1 metre to 6 metres in solution-annealed, age-hardened, cold-worked, and stress-relieved conditions. Inconel 718 (UNS N07718 / Werkstoff Nr. 2.4668) is the world’s most widely used superalloy by weight accounting for over 35% of all superalloy production globally prized for its exceptional combination of high tensile and yield strength, outstanding creep resistance up to 704 °C, and excellent resistance to oxidation and corrosion from cryogenic temperatures all the way through to elevated service conditions. Our Inconel 718 round bars are used in jet engine components, gas turbine discs, rocket motors, subsea wellheads, and precision fasteners. Contact us today for a competitive quote and fast delivery.
What Is Inconel 718 Round Bar?
Inconel 718 is a precipitation-hardenable nickel-chromium-iron superalloy uniquely formulated to deliver extremely high tensile and yield strength at both room temperature and elevated temperatures, combined with excellent fatigue life and weldability. Its strength comes from a γ” (gamma double prime) precipitation hardening mechanism involving niobium-rich precipitates within the nickel matrix — a response that is deliberately sluggish, giving Inconel 718 exceptional weldability compared to other precipitation-hardenable superalloys.
Key characteristics that make Inconel 718 the world’s most popular superalloy:
- Outstanding strength: Tensile strength up to 1,379 MPa (200 ksi) in the aged condition — far exceeding standard stainless steels
- Wide temperature service range: Retains meaningful mechanical properties from cryogenic temperatures (−253 °C / −423 °F) up to 704 °C (1,300 °F)
- Excellent weldability: Unlike many high-strength nickel alloys, Inconel 718 can be welded and brazed without cracking — critical for jet engine fabrication
- Good corrosion resistance: Resists oxidation, chloride stress-corrosion cracking, and pitting in a range of environments
- Non-magnetic: Important for certain aerospace and MRI-adjacent applications
- Precision dimensional stability: Holds tight tolerances through heat treatment, making it ideal for precision machined components
Aashish Metals supplies Inconel 718 bars in the full range of sizes and forms demanded by aerospace, defence, energy, and industrial customers.
Inconel 718 Round Bar Forms Available
- Inconel 718 Round Bar — the most widely stocked form for machined components
- Inconel 718 Bright Bar — cold-drawn, precision-tolerance bar for close-fit machined parts
- Inconel 718 Hex Bar — for valve bodies and precision fastener stock
- Inconel 718 Square Bar — for structural and special machined profiles
- Inconel 718 Flat Bar — for precision-machined pads and spacers
- Inconel 718 Forged Round Bar — hot-worked for superior grain structure and fatigue life; specified by aerospace OEMs
- Inconel 718 Black Bar — hot-rolled, as-rolled surface for non-critical fabrication
- Inconel 718 Threaded Bar — pre-threaded stock for fastener and anchor applications
- Inconel 718 Hollow Bar — for tubular components machined from bar
- Inconel 718 Rectangular Bar — for custom machined profiles
- Inconel 718 Tie Rods & Rods — straight, precision-ground rods for structural and control applications
- Werkstoff Nr. 2.4668 Bar — European-standard designation, interchangeable with ASTM B637 N07718
For complementary Inconel products, explore our Inconel 718 fasteners, Inconel 625 round bars, Inconel 600 round bars, and Special Alloy Round Bar range. See our full Inconel products catalogue.
Technical data
Inconel 718 Round Bar Specification
| Parameter | Details |
|---|---|
| Standard | ASTM B637 / ASME SB637 |
| Aerospace standards | AMS 5662, AMS 5663, AMS 5664, AMS 5962, AMS 5596 |
| Specification | AMS, ASTM, ASME, EN, DIN, JIS, ISO, BS, AISI, IS |
| Round bar diameter | 2 mm to 800 mm (custom available) |
| Bright bar diameter | 4 mm to 500 mm |
| Hex bar (A/F) | 18 mm to 57 mm (11/16" to 2-3/4") |
| Square bar | 18 mm to 47 mm (11/16" to 1-3/4") |
| Flat bar | 1/2" to 10" width, 2 mm to 150 mm thickness |
| Length | 3,000 mm / 6,000 mm, or custom cut length (1–6 m) |
| Finish | Hot Rolled (HR), Cold Drawn (CD), Centerless Ground, Peeled & Turned, Polished, Bright, Mirror, Black, Sand Blasted, Smooth Machined |
| Condition | Annealed, Solution Annealed, Age Hardened, Cold Worked, Stress Relieved |
| Technique | Hot Rolled, Cold Rolled, Cold Drawn, Forged, Extruded, Machined |
| Tolerance | H8, H9, H10, H11, H12, H13K9, K10, K11, K12 or as per client requirements |
| UNS no. | N07718 |
| Werkstoff Nr. | 2.4668 |
| HSN codes | 7505 22 00, 7505 12 20, 7228 60 99, 7604 10 20 |
| Test certificates | EN 10204 Type 3.1 / 3.2, Third-Party Inspection Report, PMI |
Inconel 718 Round Bar Chemical Composition
| Element | Min | Max |
|---|---|---|
| Ni (Nickel) | 50.0% | 55.0% |
| Cr (Chromium) | 17.0% | 21.0% |
| Fe (Iron) | Balance | Balance |
| Mo (Molybdenum) | 2.80% | 3.30% |
| Nb + Ta (Niobium + Tantalum) | 4.75% | 5.50% |
| Ti (Titanium) | 0.65% | 1.15% |
| Al (Aluminium) | 0.20% | 0.80% |
| Co (Cobalt) | — | 1.0% max |
| Mn (Manganese) | — | 0.35% max |
| Si (Silicon) | — | 0.35% max |
| C (Carbon) | — | 0.08% max |
| S (Sulphur) | — | 0.015% max |
| B (Boron) | — | 0.006% max |
Inconel 718 Hot Rolled Round Bar Dimensional Tolerances
| Specified diameter (inches) | Over (+) / Under (−) diameter tolerance |
|---|---|
| Up to 1 inch, incl. | ± 0.016" |
| Over 1 to 2 inch, incl. | +0.031" / −0.016" |
| Over 2 to 4 inch, incl. | +0.047" / −0.031" |
| Over 4 inch | +0.125" / −0.063" |
Inconel 718 Round Bar Mechanical Properties
| Temperature | Yield strength (0.2%) | Ultimate tensile strength | Elongation |
|---|---|---|---|
| Room Temp (21 °C) | 150 ksi (1,034 MPa) | 180 ksi (1,241 MPa) | 18% |
| 200 °F (93 °C) | 148 ksi (1,021 MPa) | 178 ksi (1,227 MPa) | 18% |
| 400 °F (204 °C) | 145 ksi (1,000 MPa) | 175 ksi (1,207 MPa) | 17% |
| 600 °F (316 °C) | 142 ksi (979 MPa) | 172 ksi (1,186 MPa) | 17% |
| 800 °F (427 °C) | 140 ksi (965 MPa) | 170 ksi (1,172 MPa) | 16% |
| 1,000 °F (538 °C) | 138 ksi (952 MPa) | 165 ksi (1,138 MPa) | 16% |
| 1,200 °F (649 °C) | 130 ksi (896 MPa) | 155 ksi (1,069 MPa) | 18% |
| 1,400 °F (760 °C) | 85 ksi (586 MPa) | 85 ksi (586 MPa) | 25% |
Physical Properties of Inconel 718 Round Bar
| Property | Value |
|---|---|
| Density | 8.19 g/cm³ (0.296 lb/in³) |
| Melting range | 1,380 – 1,460 °C (2,516 – 2,660 °F) |
| Electrical resistivity | 78 µΩ·cm at 20 °C |
| Thermal conductivity | 11.4 W/m·K at 21 °C |
| Modulus of elasticity | 207 GPa (30 × 10⁶ psi) at 20 °C |
| Specific heat capacity | 435 J/kg·K at 21 °C |
| Coefficient of thermal expansion | 13.0 µm/m·°C (20–100 °C) |
Equivalent Grades of Inconel 718 Round Bar
| Standard | Grade / designation |
|---|---|
| UNS | N07718 |
| Werkstoff Nr. | 2.4668 |
| BS | NA 51 |
| EN | NiCr19Fe19Nb5Mo3 |
| JIS | NCF 718 |
| DIN | 17744 |
| ASTM | B637 |
| AMS | 5662, 5663, 5664, 5962, 5596 |
Inconel 718 vs Inconel 625 — Which Round Bar Should You Choose?
| Property | Inconel 718 | Inconel 625 |
|---|---|---|
| UNS no. | N07718 | N06625 |
| Werkstoff Nr. | 2.4668 | 2.4856 |
| Key strengthening | Precipitation hardening (γ'', γ') | Solid solution |
| Tensile strength (aged) | 1,241–1,379 MPa | 827–1,103 MPa |
| Yield strength (aged) | 1,034–1,241 MPa | 414–758 MPa |
| Max service temperature | 704 °C (1,300 °F) | 982 °C (1,800 °F) |
| Weldability | Excellent (key advantage) | Good |
| Corrosion resistance | Good — pitting and SCC | Excellent — seawater, acids |
| Primary use | Aerospace turbines, high-strength fasteners | Chemical, marine, offshore |
| ASTM standard | B637 | B446 (bar) |
| Choose when... | Maximum strength + weldability | Superior corrosion resistance at lower strength |
Heat Treatment Conditions Available
| Condition | Description | Key effect |
|---|---|---|
| Annealed | Heated and slow-cooled to relieve stress | Reduces hardness, improves ductility and machinability |
| Solution Annealed | Heated to ~980–1,065 °C and rapidly quenched | Dissolves precipitates; maximises corrosion resistance; precursor to ageing |
| Age Hardened (Precipitation Hardened) | Solution anneal + double ageing at 720 °C then 620 °C | Maximises tensile and yield strength — full aerospace strength |
| Cold Worked | Mechanically worked at room temperature | Increases hardness and yield strength without heat treatment |
| Stress Relieved | Mild heat treatment below ageing temperature | Relieves residual stresses from machining or welding |
Standards & Certifications
| Standard body | Specification | Application |
|---|---|---|
| ASTM | B637 | Inconel 718 precipitation-hardening nickel alloy bar |
| ASME | SB637 | Pressure vessel / boiler applications |
| AMS | 5662 | Inconel 718 bar — solution annealed |
| AMS | 5663 | Inconel 718 bar — precipitation hardened |
| AMS | 5664 | Inconel 718 bar — annealed (lower strength) |
| AMS | 5962 | Inconel 718 bar — special requirements |
| AMS | 5596 | Inconel 718 sheet, strip, plate — same alloy |
| ASTM | B166 | Inconel rod, bar and wire |
| ASME | SB166 | Pressure vessel rod, bar and wire |
| EN | NiCr19Fe19Nb5Mo3 | European equivalent |
| DIN | 17744 | German standard |
| JIS | NCF 718 | Japanese standard |
| BS | NA 51 | British standard |
| NACE | MR0175 / ISO 15156 | Sour gas / H₂S service |
| AS | 91208 | Aerospace quality system |
Test Certificates Available
- EN 10204 Type 3.1 (standard with every order)
- EN 10204 Type 3.2 (third-party witnessed)
- PMI (Positive Material Identification) Report
- Third-Party Inspection (Bureau Veritas, SGS, TÜV)
- Raw Materials Certificate, Country of Origin Certificate
Where Inconel 718 Round Bars Are Used
Inconel 718 is the world’s most produced superalloy, and for good reason — its unique combination of weldability, ultra-high strength, and wide service temperature range makes it irreplaceable in the most demanding engineering applications.
Aerospace & Defence (Primary Application) Inconel 718 bar stock is the standard material for gas turbine engine discs, turbine blades, compressor blades, afterburner components, thrust reversers, airframe structural elements, and high-temperature fasteners. Its combination of high strength at cryogenic conditions and retention of mechanical properties up to 704 °C makes it uniquely suited to this role. Rocket motor components and spacecraft structures also rely on Inconel 718’s strength from cryogenic to elevated temperatures, including excellent vibration fatigue resistance.
Oil & Gas / Subsea Inconel 718 bars are used for subsea wellhead components, valves, choke bodies, pressure vessel trim, and high-strength fasteners in sour-gas (H₂S) environments — especially for components requiring NACE MR0175 compliance. Pair with our Inconel 718 fasteners for complete corrosion-resistant fastener packages.
Power Generation Gas turbine components, steam turbine discs, and nuclear reactor fuel element spacers use Inconel 718 round bars for their high strength, weldability, and dimensional stability through thermal cycling.
Chemical & Marine Pump shafts, valve stems, agitator shafts, and marine propulsion components operating in aggressive chemical or seawater environments — where both corrosion resistance and strength are non-negotiable.
Automotive & Motorsport Turbocharger wheels, exhaust valves, and high-performance engine fasteners in race engines and high-performance vehicles.
Medical & Research Non-magnetic character and biocompatibility make Inconel 718 suitable for medical implants and laboratory instrument components.
HSN Codes for Inconel 718 Round Bars:
- 7505 22 00 (Nickel alloy bars / rods — wrought)
- 7505 12 20
- 7228 60 99
- 7604 10 20
Manufacturing Techniques
Inconel 718 round bars are produced through several manufacturing routes:
Hot Rolling — Standard production method for most diameter ranges. Bars are rolled at high temperature, giving good microstructure and mechanical properties. Surface is black (as-rolled) and tolerances are wider.
Cold Drawing — Bars are drawn through dies at room temperature after hot rolling, producing tighter tolerances, improved surface finish, and increased strength. Ideal for precision machining.
Forging — Closed-die or open-die forging produces bars with superior grain refinement, higher fatigue strength, and better impact toughness. AMS 5662 forged bar is the standard aerospace specification for high-integrity rotating components.
Extrusion — Used for larger diameter bars and special profiles.
Machining — Centerless grinding and turned/peeled finish options provide the tightest tolerances and best surface quality.
FAQs - Inconel 718 Round Bar
Inconel 718 round bar is used primarily in aerospace gas turbine engine discs, turbine blades, compressor shafts, afterburner components, rocket motor parts, and high-strength fasteners. It is also used in oil & gas subsea equipment, nuclear reactor components, marine propulsion shafts, and high-performance automotive engine parts — anywhere requiring maximum strength combined with good corrosion resistance.
Aashish Metals stocks Inconel 718 round bars from 2 mm to 800 mm in diameter (custom sizes available), with lengths of 3,000 mm and 6,000 mm as standard, or custom cut lengths from 1 to 6 metres.
AMS 5662 covers Inconel 718 in the solution-annealed (softened) condition — used as the starting condition for subsequent machining before final age hardening. AMS 5663 covers Inconel 718 in the fully precipitation-hardened (aged) condition, delivering maximum tensile and yield strength for direct use in structural and rotating components.
Yes — and this is one of Inconel 718’s key advantages over other precipitation-hardenable superalloys. Its sluggish precipitation hardening response means it resists post-weld cracking. TIG and MIG welding are both used, and the alloy can be welded in the solution-annealed condition then age hardened after welding.
Inconel 718 retains useful mechanical properties from cryogenic temperatures (−253 °C / −423 °F) up to approximately 704 °C (1,300 °F). Above 704 °C, creep becomes a limiting factor. For higher temperature service, Inconel 625 or Waspaloy may be more appropriate.
Inconel 718 round bar prices vary by diameter, condition (annealed vs aged), quantity, and current raw material costs. Indicative market ranges: bright bars from US $0.5–1,000/piece (FOB); polished bars from US $0.5–1,000/piece; Werkstoff Nr. 2.4668 bar from US $1–900/piece. Contact Aashish Metals for a current competitive quote.
Get a Fast Quote for Inconel 718 Round Bars
Whether you need a single bar for a precision machining trial or a bulk consignment for an aerospace production run, Aashish Metals has the stock, the certifications, and the supply-chain expertise to deliver Inconel 718 round bars to your exact specification.
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